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Questions tagged [torque]

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0
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1answer
17 views

Relationship of Slip and Angle Between Rotor and Stator Flux for Induction Motor

I know how slip and flux angle individually affect torque of induction motors but I can't understand the relationship between slip and flux angle in terms of torque. Do they both have different effect ...
0
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0answers
10 views

Replacing a motor under load-torque with 2 motors to give similar performance

I have the following setup: A servo DC motor which is connected to a drum and the drum drives a conveyor belt. There is a pulley at the other end of the belt which is the same radius as the drum. ...
0
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3answers
52 views

Speed Current Relationship in İnduction Motors

It is said that speed of an induction motor depends on its frequency and torque depends on current. But I will explain what i cant understand here. Let’s think an induction motor runs with constant ...
1
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1answer
22 views

Slip Control vs Constant V/F Control for 3-Phase ACIM

I am trying to understand how is Slip Control different from Constant V/F control. If I need to control the speed of 3-phase ACIM then its slip would obviously change with its rotational speed then ...
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0answers
29 views

Induction Machine: What would multiplying the angular electrical frequency of the machine with the electromagnetic torque give?

I understand that multiplying the output torque (load torque or mechanical torque) \$T_m\$ with the mechanical speed \$w_m\$ we obtain output power. But what would multiplying the electromagnetic ...
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2answers
105 views

Why are stepper motor phase currents a sinusoildal waveform?

I don't know if this is a really dumb question or not, but I've seen all kinds of torque, peak-current and RMS discussions related to current drive output for stepper motors. I acknowledge that for a ...
3
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3answers
53 views

How to make sense of speed vs Torque curves in speed control mode

I am operating my motor in closed loop speed control mode using motor controller. Toque vs speed curves gives us a relation between them which is one-one correspondence. But in a closed loop speed ...
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0answers
30 views

How to read Torque-Power diagram for an asynchronous motor

I'm sorry if my question is too stupid, but I am not able to correctly understand how to compare the information showed by the torque-power diagram with the motor test data for a 2000W Asynchronous ...
1
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3answers
101 views

why speed is not directly proportional to torque in dc machine?

I have a conceptual doubt about torque-speed relation in a DC motors. It's probably a gap in my thinking but I'm posting this question anyway. As per me "in case of dc machine we see that the armature ...
2
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2answers
98 views

Sizing a motor for a conveyor

There is a plethora of information on motor sizing on the internet discussing the rated voltage, current, torque and power of the motor, and how these parameters should be selected based on the load ...
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0answers
48 views

Identification of BLDC Motor

I would to know if make sense to obtain the current of the BLDC motor, using the BLDC motor torque measurement. In particular, i'm able to measure the torque of a BLDC motor but not the current that ...
0
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3answers
65 views

Variable Current Draw from motor for torque control [closed]

I am building an electric go-kart. I would like to use regenerative braking. I would like to have a brake pedal that controls the amount of torque (slowing the motor and wheels down) that the back emf ...
1
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1answer
98 views

Calculate torque from current induced in a single phase of a 3 phase AC Induction servo motor

I'm looking to measure the torque or slip angle on an AC induction (asynchronous) servo motor given the current induced in one of its phases. The servo and drive is yaskawa. Example data is shown ...
0
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1answer
114 views

Torque-Speed Equation for Induction Motor

I am looking for the Torque-speed equation on an Induction Motor that is used to draw the curve.
0
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0answers
32 views

Asynchronous motor with FOC control and torque constant

So, I am studying an application with an asynchronous motor. Attached to the motor i find a driver and the control of the motor is based on the calculation of an equivalent torque constant for the ...
0
votes
1answer
362 views

Difference between Field Oriented Control and Direct Torque Control

What is the fundamental difference between Field Oriented Control (FOC) and Direct Torque Control (DTC) (say for an induction motor)? Is it really the same as described in https://www.researchgate.net/...
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0answers
19 views

How to add back emf as part of this sinusoidal commutation equation

I recently found a nice article on sinusoidal commutation which has a simple exposition of the subject. The torque is derived from first principles but the equation seems not to include BEMF. Does ...
2
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0answers
77 views

BLDC motor poles versus Torque and RPM

How to calculate the cost of a BLDC motor? Assume I need 24 stator coils of height 10 mm and width 5 mm. Is there any formula for torque comparison with increasing the number of poles?
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2answers
243 views

Estimating torque of AC motor

Given voltage, measured current draw, and RPMs of an AC motor, and an estimated efficiency rating, is it possible to calculate the actual instantaneous output torque? Or is other information required? ...
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0answers
24 views

Phase voltage and torque of stepper motor

When I use a chopper type driver for drive a stepper motor how it effect the rated phase voltage? Is there any relation between rated phase voltage and running torque of the stepper?
0
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1answer
57 views

Dc motor as torque transducer for BLDC motor

I bought a cheap BLDC motor on some Chinese website and could not find its characteristics. However, I have A28-400 24V amp flow Dc motor with its characteristics. If I'm able to build a test rig to ...
1
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1answer
83 views

Problems calculating torque for a motor opening a door

I want to make a device that can open a door from a cabinet. The door is about 4 meters wide and about 0.5 meters high. (if the width causes a problem I can split it in 1 meters section with one motor ...
0
votes
1answer
35 views

Motor selection for high speed rotary actuation

I am trying to select a motor for a high-speed application where I need to rotate a load bearing cylindrical disc at 20,000 rpm. The total mass of the disc along with its load is approximately 1.5 - 2 ...
0
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1answer
448 views

Does the motor speed change with the fully automatic star(wye)/delta starter?

At no load, I connected a 380V motor to start in the star connection for 5 seconds and thereafter change to the delta connection. I understand that torque will change since the current will change as ...
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3answers
80 views

Difference between lower and higher current rated ESCs and electric skateboard questions

I am starting a project and would like to build an electric skateboard. Here are the specs for the parts that I have gathered so far: a. Two 90mm wheels that each contain a built-in BLDC motor. The ...
0
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0answers
285 views

Run Stepper motor with more torque and smoothly

I have a stepper motor and its torque curve is below. I am trying to get more torque from the motor. Therefore, I decided to setup my driver to half step. I am using an Arduino for generate the ...
0
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1answer
69 views

About the torque of mini servo motor

I'd like to automate button pressing on Nintendo DSi for a certain purpose. For this, I think I will use a raspberry pi and a mini servo motor SG-90. My question is, would the SG-90 would give ...
2
votes
2answers
171 views

What is torque-ampere ratio at electric machines? How it is related with machine efficiency?

When I am reading a journal about SRM (switched reluctance machines) it said that outer rotor design has better efficiency due to higher torque ampere ratio. How it is related with efficiency?
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4answers
272 views

Induction Motor Torque Slip Characteristics

This question was asked in a interview for Scientist position. For a given T-slip characteristics of an induction motor, I want the same maximum torque but at a lower slip value? Is it even possible?...
0
votes
1answer
156 views

How can I decrease the torque of a stepper motor?

I would like to take a powerful stepper motor, and sometimes weaken it, so it will stall when it hits resistance. I understand that I can reduce torque with microstepping, but it does not seem to be ...
1
vote
1answer
571 views

12 Volt vs a 24 Volt Motor

I have read that using a higher voltage motor would need less current to get the same power. I understand that P = IV and how that works. My question is if the 24 V motor would get half of the current,...
0
votes
1answer
35 views

DC motor selection criteria: number of poles

I’m designing a system to measure an arbitrary motor torque curve. As an active load, I’m searching for a brushed DC motor that is able to withstand some degree of torque and speed as well as comply ...
1
vote
1answer
250 views

stepper motor constant speed under load?

Before posting this question I've been looking up google but can't find an answer to this question other than "speed control and torque control". I've done a lot of research on steppers but still don'...
1
vote
1answer
353 views

Locked Rotor Torque

Hi All I am try to produce a torque curve using the standard torque equation, using the parameters given by the manufacturer as in the attached picture. $$Torque =\dfrac{1}{\omega_s}\cdot\dfrac{V_1^...
-1
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1answer
244 views

Load torque and Rotor torque

What would happen if the load torque became greater than the rotor torque developed by the motor?
0
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0answers
35 views

FIT0186 Torque calcution

I am trying to find a strong motor which can deliver a torque at least 0.2Nm and around 130RPM. While trying to find a 6mm shaft geared motor with feedback,the required torque and rotational was ...
1
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0answers
307 views

Meaning of motor constants for three-phase PMSM

When looking at three-phase permanent magnet synchronous (brushless) motors, \$K_T\$ and \$K_V\$ numbers are often specified. Also, controllers for these motors typically specify maximum currents. ...
-3
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1answer
84 views

How do I know what the max volts and amps for this motor [closed]

Got it from the brush roller in a shark vacuum
0
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0answers
75 views

Using a 670Kv outrunner motor, how can I calculate a way to get variable low speed and high torque?

I have an E-flite Power 46, 670Kv outrunner motor (Kv is the shorthand for RPM/volts, it has 3.9A idle current, 40A maximum continuous current, 14.4-19.2 voltage range, 925 watt maximum) but I wish to ...
0
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0answers
51 views

dc motor calculation

I'm having trouble with this problem. Suppose the machine was at rest, and a weight of 5 kg was suspended from a horizontal bar of length 80 cm attached to the shaft. What current must be applied to ...
0
votes
1answer
651 views

Tension control using a DC motor

I would like to control the tension of a string attached to the armature of a DC motor. I think the StackExchange thread here does not fully answer my question. Here the schematic (pencil sketch) of a ...
0
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0answers
121 views

finding air gap shear stress in a permanent magnet generator

I have found that the air gap shear stress is a limiting factor when sizing a generator, but how do I find the value for it?
0
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1answer
227 views

gear motor can be used as generator

I am in doubt with a motors operation, I am not sure whether this question could be asked here, I have a car wiper motor with two speed operation,It uses a PM dc motor with worm gear inside, so it is ...
0
votes
1answer
1k views

is there a calculation for no load current on BLDC motor?

I am calculating various values for a range of motors. However, I need to find the no load current of a motor or io to allow me to calculate other values, based on the information I have below for a ...
0
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2answers
356 views

Decrease torque of an electric motor

I got this automatic antenna for a project, but the torque is a little too high. It runs on 12V. I've figured the way it works is, it knows to stop when the load increases to a certain point (i.e. ...
1
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0answers
68 views

Stepper motor torque requirements

I have a robot that has a load of 60kg and it has to move using 4 stepper motors. I saw from previous searches that the torque required by the motors to move is Force times the wheel radius. COF = 0....
0
votes
1answer
57 views

How does a motor perform when it is given a load greater than its rated ability?

I have a 24V motor which is rated output of 250W at 2750 rpm (I calculated torque to be .87 Nm). If I have a wheel which needs 1 Nm of torque to retain a speed of 2750 rpm, I assume that the motor ...
0
votes
2answers
617 views

Why does torque increase with rotor current in an AC induction motor?

In my understanding, the EMF induced on the rotor of an AC induction motor induces a current, and the larger this current, the greater the rotor's torque will be. Could someone please explain: why ...
0
votes
1answer
621 views

Asynchronous induction motor, current in stator

My question is, how was \$ I_{stator} \$ found out? Y -connected 3-phase 4-pole induction motor has \$ R_r = 0.5\$ Ohm , and is supplied from a 480V l - l, 60Hz source. It is connected to a load ...
2
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1answer
88 views

DC motor characteristics and control

I don't have a lot of experience into detailed / calculated selection of DC motors based on their specs. Now, I'm starting to do it for robotics competitions as I'm progressing to more serious ones. ...